Advanced Mechanical Seal Quiz #1
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Advanced Mechanical Seal Topics
- 1.
Chesterton's Rotary Equipment Sales Tool can be used to
- A.
Determine the type of pump you are sealing
- B.
Determine the flow produced by a single seal
- C.
Determine the actual PV based on the operating conditions
- D.
Determine the density of the fluid sealed
Correct Answer
C. Determine the actual PV based on the operating conditionsExplanation
Chesterton's Rotary Equipment Sales Tool can be used to determine the actual PV (Pressure-Volume) based on the operating conditions. This means that the tool helps in calculating the pressure and volume of the fluid being sealed, taking into account the specific operating conditions such as temperature, pressure, and flow rate. By determining the actual PV, users can make more accurate decisions and select the appropriate equipment for their needs.Rate this question:
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- 2.
When working to seal a fluid we use environmental controls to make the fluid
- A.
Dirty, hot and sticky
- B.
Clean, cool and lubricious(film forming)
- C.
Dirty, cool and sticky
- D.
Corrosive, abrasive and hot
Correct Answer
B. Clean, cool and lubricious(film forming)Explanation
When working to seal a fluid, it is important to use environmental controls that make the fluid clean, cool, and lubricious (film forming). This means that the fluid should be free from contaminants, maintained at a lower temperature to prevent overheating, and have a lubricating property that allows for smooth movement and reduces friction. These conditions help to ensure effective sealing and prevent any damage or wear to the sealing components.Rate this question:
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- 3.
It is impossible to demonstrate the financial value of one environmental control versus another.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement is false because it is possible to demonstrate the financial value of one environmental control versus another. By conducting cost-benefit analyses and comparing the costs and benefits of different environmental controls, it is possible to determine their financial value. This can include evaluating the costs of implementation, maintenance, and potential savings or benefits in terms of energy efficiency, reduced pollution, or improved health outcomes.Rate this question:
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- 4.
If a fluid is sticky and a poor seal face lubricant(molten sulfur) we must
- A.
Use a single seal with a soft carbon seal face versus a tungsten carbide seal face
- B.
Use a dual seal or HVS with a clean barrier fluid/Lubricant pressured to 1 bar higher than the sealed pressure
- C.
Use a metal bellows seal with Inconnel 718 metal bellows and plan 11
- D.
Use a stationary split seal with a high pressure holder
Correct Answer
B. Use a dual seal or HVS with a clean barrier fluid/Lubricant pressured to 1 bar higher than the sealed pressureExplanation
The correct answer suggests that when dealing with a sticky fluid and a poor seal face lubricant, the best approach is to use a dual seal or High Velocity Seal (HVS) with a clean barrier fluid or lubricant. This barrier fluid should be pressurized to 1 bar higher than the sealed pressure. This arrangement helps to prevent leakage and maintain a proper seal in challenging conditions.Rate this question:
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- 5.
The best way to determine the best environmental control option is to
- A.
Estimate the costs and match to the process needs
- B.
Select based on the highest sales value
- C.
Specify the Spiraltrac device in every pump
- D.
Specify a flow meter for every pump
Correct Answer
A. Estimate the costs and match to the process needsExplanation
The best way to determine the best environmental control option is to estimate the costs and match them to the process needs. This means that one should consider the financial implications of each control option and assess how well it aligns with the specific requirements of the process. By estimating the costs and evaluating how well the options meet the process needs, one can make an informed decision on the most suitable environmental control option.Rate this question:
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- 6.
Liquid lubricated mechanical seals can run at high speed with no seal face lubrication
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Liquid lubricated mechanical seals cannot run at high speed with no seal face lubrication because the seal faces need to be lubricated in order to reduce friction and prevent excessive heat generation. Without proper lubrication, the seal faces would wear out quickly and lead to seal failure. Therefore, it is important to provide adequate lubrication to ensure the smooth operation of the mechanical seal at high speeds.Rate this question:
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- 7.
A horizontal split case pump has a suction pressure of 2 bar and a discharge pressure of 10 bar. What is the seal chamber pressure?
- A.
2 bar
- B.
4 bar
- C.
8 bar
- D.
10 bar
Correct Answer
A. 2 barExplanation
The seal chamber pressure of a horizontal split case pump is typically equal to the suction pressure. In this case, the suction pressure is given as 2 bar, so the seal chamber pressure would also be 2 bar.Rate this question:
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- 8.
What is the main difference between a 442 and 442M Split Seal?
- A.
Split versus Non-Split
- B.
Cast Gland Only
- C.
Rotary versus Stationary Seal
- D.
Rotates Narrow Face to Avoid Wiping, Uses a Machined Gland and Allows Motion
Correct Answer
D. Rotates Narrow Face to Avoid Wiping, Uses a Machined Gland and Allows MotionExplanation
The main difference between a 442 and 442M Split Seal is that the 442M Split Seal rotates the narrow face to avoid wiping, uses a machined gland, and allows motion. This means that the 442M Split Seal is designed to prevent wiping and damage to the seal face, while also allowing for movement and flexibility. In contrast, the 442 Split Seal may not have these features and may not be able to rotate the narrow face or allow for motion.Rate this question:
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- 9.
What pump manufacturer and models would you use DirectFit Seals?
- A.
Warman AH Series
- B.
Sulzer APP and APT
- C.
Goulds 3196 Series
- D.
Goulds 4400 Series
Correct Answer
B. Sulzer APP and APTExplanation
DirectFit Seals are specifically designed to be compatible with certain pump manufacturer and models. In this case, the correct answer suggests that the Sulzer APP and APT pumps are suitable for using DirectFit Seals. It implies that these pumps have a compatible design and can easily accommodate the DirectFit Seals without any modifications or additional adjustments. Other pump manufacturers and models listed in the question may not be suitable for using DirectFit Seals.Rate this question:
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- 10.
Which mechanical seal model can be used in hot water up to 170 C/350 F with no cooling?
- A.
180
- B.
155
- C.
180H
- D.
150
Correct Answer
C. 180HExplanation
The correct answer is 180H. This mechanical seal model is designed to be used in hot water up to 170 C/350 F without the need for cooling. The "H" in 180H likely stands for "high temperature" or "hot water," indicating that this specific model is specifically designed and capable of withstanding higher temperatures without the need for additional cooling mechanisms.Rate this question:
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- 11.
Which seal model below is not used on mixers or reactors normally?
- A.
442M
- B.
280M
- C.
150
- D.
4400H-CW
Correct Answer
C. 150Explanation
The seal model 150 is not used on mixers or reactors normally.Rate this question:
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- 12.
180H hydro pad seals can work very well in a light slurry.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement suggests that 180H hydro pad seals can work well in a light slurry, but the correct answer is False. This means that 180H hydro pad seals do not perform well in a light slurry.Rate this question:
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- 13.
If the 180H is used in a service which starts at 150C, then is cooled to 20 C we would expect
- A.
Smooth service
- B.
Happy customers
- C.
Leakage at the cooler temperature
- D.
High heat generation
Correct Answer
C. Leakage at the cooler temperatureExplanation
When the 180H is used in a service that starts at 150C and is then cooled to 20C, we would expect leakage at the cooler temperature. This is because the sudden change in temperature can cause the material of the 180H to contract, leading to potential leaks or cracks. The cooler temperature may cause the material to become more brittle and less able to withstand the pressure, resulting in leakage.Rate this question:
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- 14.
The only difference between the 186 and the 186 HT is they use different secondary seals
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
186 uses Hastelloy C Metal bellows, 186HT uses AM350 or Inconnel 718 metal bellows for strength at high temperatures.Rate this question:
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- 15.
A pumping ring seal (180PR/442PR) is typically considered in service above 350 F or 170 C.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
A pumping ring seal (180PR/442PR) is typically considered in service above 350 F or 170 C because at temperatures below this range, the seal may not be able to withstand the high heat and may fail. Therefore, it is recommended to use this type of seal for applications where the temperature exceeds 350 F or 170 C to ensure its proper functioning and longevity.Rate this question:
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Current Version
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Aug 14, 2024Quiz Edited by
ProProfs Editorial Team -
Jul 15, 2013Quiz Created by
Awglobaltrain